Those who are pure in heart achieve God-consciousness; they are truly and actually aware of God at the centre of their being.
The faith of every man, O Arjuna, accords with his nature, Man is made up of faith; as is his faith, so is he. The threefold austerity practiced with faith by men of balanced mind, without any expectation of reward, is said to be pure.
For him who has completed the journey, for him who is sorrowless, for him who from everything is wholly free, for him who has destroyed all ties, the fever of passion exists not… He is like a pool, unsullied by mud; to such a balanced one, life’s wanderings do not arise. Calm is his mind, calm is his speech, calm is his action, who, rightly knowing, is wholly freed, perfectly peaceful and equipoised.

